66280481 has 4 divisors (see below), whose sum is σ = 67690752. Its totient is φ = 64870212.

The previous prime is 66280469. The next prime is 66280483. The reversal of 66280481 is 18408266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18408266 = 2 ⋅9204133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66280481 is a prime.

It is a super-2 number, since 2×66280481² = 8786204323182722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66280483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705065 + ... + 705158.

It is an arithmetic number, because the mean of its divisors is an integer number (16922688).

Almost surely, 2^66280481 is an apocalyptic number.

It is an amenable number.

66280481 is a deficient number, since it is larger than the sum of its proper divisors (1410271).

66280481 is a wasteful number, since it uses less digits than its factorization.

66280481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410270.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 66280481 is about 8141.2825156728. The cubic root of 66280481 is about 404.6956632502.

The spelling of 66280481 in words is "sixty-six million, two hundred eighty thousand, four hundred eighty-one".